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218 lines
6.8 KiB
218 lines
6.8 KiB
defmodule AutoLinker.Parser do
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@moduledoc """
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Module to handle parsing the the input string.
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"""
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alias AutoLinker.Builder
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@doc """
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Parse the given string, identifying items to link.
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Parses the string, replacing the matching urls and phone numbers with an html link.
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## Examples
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iex> AutoLinker.Parser.parse("Check out google.com")
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"Check out <a href='http://google.com' class='auto-linker' target='_blank' rel='noopener noreferrer'>google.com</a>"
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iex> AutoLinker.Parser.parse("call me at x9999", phone: true)
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~s{call me at <a href="#" class="phone-number" data-phone="9999">x9999</a>}
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iex> AutoLinker.Parser.parse("or at home on 555.555.5555", phone: true)
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~s{or at home on <a href="#" class="phone-number" data-phone="5555555555">555.555.5555</a>}
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iex> AutoLinker.Parser.parse(", work (555) 555-5555", phone: true)
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~s{, work <a href="#" class="phone-number" data-phone="5555555555">(555) 555-5555</a>}
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"""
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# @invalid_url ~r/\.\.+/
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@invalid_url ~r/(\.\.+)|(^(\d+\.){1,2}\d+$)/
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@match_url ~r{^[\w\.-]+(?:\.[\w\.-]+)+[\w\-\._~:/?#[\]@!\$&'\(\)\*\+,;=.]+$}
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@match_scheme ~r{^(?:http(s)?:\/\/)?[\w.-]+(?:\.[\w\.-]+)+[\w\-\._~:/?#[\]@!\$&'\(\)\*\+,;=.]+$}
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@match_phone ~r"((?:x\d{2,7})|(?:(?:\+?1\s?(?:[.-]\s?)?)?(?:\(\s?(?:[2-9]1[02-9]|[2-9][02-8]1|[2-9][02-8][02-9])\s?\)|(?:[2-9]1[02-9]|[2-9][02-8]1|[2-9][02-8][02-9]))\s?(?:[.-]\s?)?)(?:[2-9]1[02-9]|[2-9][02-9]1|[2-9][02-9]{2})\s?(?:[.-]\s?)?(?:[0-9]{4}))"
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@default_opts ~w(url)a
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def parse(text, opts \\ %{})
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def parse(text, list) when is_list(list), do: parse(text, Enum.into(list, %{}))
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def parse(text, opts) do
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config =
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:auto_linker
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|> Application.get_env(:opts, [])
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|> Enum.into(%{})
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|> Map.put(
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:attributes,
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Application.get_env(:auto_linker, :attributes, [])
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)
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opts =
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Enum.reduce(@default_opts, opts, fn opt, acc ->
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if is_nil(opts[opt]) and is_nil(config[opt]) do
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Map.put(acc, opt, true)
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else
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acc
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end
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end)
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do_parse(text, Map.merge(config, opts))
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end
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defp do_parse(text, %{phone: false} = opts), do: do_parse(text, Map.delete(opts, :phone))
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defp do_parse(text, %{url: false} = opts), do: do_parse(text, Map.delete(opts, :url))
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defp do_parse(text, %{phone: _} = opts) do
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text
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|> do_parse(false, opts, {"", "", :parsing}, &check_and_link_phone/3)
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|> do_parse(Map.delete(opts, :phone))
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end
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defp do_parse(text, %{markdown: true} = opts) do
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text
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|> Builder.create_markdown_links(opts)
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|> do_parse(Map.delete(opts, :markdown))
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end
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defp do_parse(text, %{url: _} = opts) do
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if (exclude = Map.get(opts, :exclude_pattern, false)) && String.starts_with?(text, exclude) do
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text
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else
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do_parse(text, Map.get(opts, :scheme, false), opts, {"", "", :parsing}, &check_and_link/3)
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end
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|> do_parse(Map.delete(opts, :url))
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end
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defp do_parse(text, _), do: text
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defp do_parse("", _scheme, _opts, {"", acc, _}, _handler),
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do: acc
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defp do_parse("", scheme, opts, {buffer, acc, _}, handler),
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do: acc <> handler.(buffer, scheme, opts)
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defp do_parse("<a" <> text, scheme, opts, {buffer, acc, :parsing}, handler),
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do: do_parse(text, scheme, opts, {"", acc <> buffer <> "<a", :skip}, handler)
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defp do_parse("</a>" <> text, scheme, opts, {buffer, acc, :skip}, handler),
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do: do_parse(text, scheme, opts, {"", acc <> buffer <> "</a>", :parsing}, handler)
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defp do_parse("<" <> text, scheme, opts, {"", acc, :parsing}, handler),
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do: do_parse(text, scheme, opts, {"<", acc, {:open, 1}}, handler)
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defp do_parse(">" <> text, scheme, opts, {buffer, acc, {:attrs, level}}, handler),
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do: do_parse(text, scheme, opts, {"", acc <> buffer <> ">", {:html, level}}, handler)
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defp do_parse(<<ch::8>> <> text, scheme, opts, {"", acc, {:attrs, level}}, handler),
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do: do_parse(text, scheme, opts, {"", acc <> <<ch::8>>, {:attrs, level}}, handler)
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defp do_parse("</" <> text, scheme, opts, {buffer, acc, {:html, level}}, handler),
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do:
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do_parse(
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text,
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scheme,
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opts,
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{"", acc <> handler.(buffer, scheme, opts) <> "</", {:close, level}},
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handler
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)
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defp do_parse(">" <> text, scheme, opts, {buffer, acc, {:close, 1}}, handler),
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do: do_parse(text, scheme, opts, {"", acc <> buffer <> ">", :parsing}, handler)
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defp do_parse(">" <> text, scheme, opts, {buffer, acc, {:close, level}}, handler),
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do: do_parse(text, scheme, opts, {"", acc <> buffer <> ">", {:html, level - 1}}, handler)
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defp do_parse(" " <> text, scheme, opts, {buffer, acc, {:open, level}}, handler),
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do: do_parse(text, scheme, opts, {"", acc <> buffer <> " ", {:attrs, level}}, handler)
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defp do_parse("\n" <> text, scheme, opts, {buffer, acc, {:open, level}}, handler),
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do: do_parse(text, scheme, opts, {"", acc <> buffer <> "\n", {:attrs, level}}, handler)
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# default cases where state is not important
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defp do_parse(" " <> text, scheme, %{phone: _} = opts, {buffer, acc, state}, handler),
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do: do_parse(text, scheme, opts, {buffer <> " ", acc, state}, handler)
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defp do_parse(" " <> text, scheme, opts, {buffer, acc, state}, handler),
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do:
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do_parse(
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text,
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scheme,
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opts,
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{"", acc <> handler.(buffer, scheme, opts) <> " ", state},
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handler
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)
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defp do_parse("\n" <> text, scheme, opts, {buffer, acc, state}, handler),
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do:
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do_parse(
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text,
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scheme,
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opts,
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{"", acc <> handler.(buffer, scheme, opts) <> "\n", state},
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handler
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)
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defp do_parse(<<ch::8>>, scheme, opts, {buffer, acc, state}, handler),
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do:
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do_parse(
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"",
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scheme,
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opts,
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{"", acc <> handler.(buffer <> <<ch::8>>, scheme, opts), state},
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handler
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)
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defp do_parse(<<ch::8>> <> text, scheme, opts, {buffer, acc, state}, handler),
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do: do_parse(text, scheme, opts, {buffer <> <<ch::8>>, acc, state}, handler)
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def check_and_link(buffer, scheme, opts) do
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buffer
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|> is_url?(scheme)
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|> link_url(buffer, opts)
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end
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def check_and_link_phone(buffer, _, opts) do
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buffer
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|> match_phone
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|> link_phone(buffer, opts)
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end
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@doc false
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def is_url?(buffer, true) do
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if Regex.match?(@invalid_url, buffer) do
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false
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else
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Regex.match?(@match_scheme, buffer)
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end
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end
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def is_url?(buffer, _) do
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if Regex.match?(@invalid_url, buffer) do
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false
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else
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Regex.match?(@match_url, buffer)
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end
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end
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@doc false
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def match_phone(buffer) do
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case Regex.scan(@match_phone, buffer) do
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[] -> nil
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other -> other
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end
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end
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def link_phone(nil, buffer, _), do: buffer
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def link_phone(list, buffer, opts) do
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Builder.create_phone_link(list, buffer, opts)
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end
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@doc false
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def link_url(true, buffer, opts) do
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Builder.create_link(buffer, opts)
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end
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def link_url(_, buffer, _opts), do: buffer
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end
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